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EFFECT OF N FERTILIZATION AND THE HARVEST DATE ON THE ACCUMULATION OF DRY WEIGHT, ORGANIC AND MINERAL NUTRIENTS IN PLANTS OF SELECTED PEA CULTIVARS

Waldemar Helios1, Andrzej Kotecki21 Department of Plant Cultivation,
University of Agriculture in Wrocław, Poland2 Department of Plant Cultivation,
Wrocław University of Environmental and Life Sciences, Poland

In 2000-2002 a field experiment carried out at the Pawłowice Agricultural Experiment Station, in the vicinity of Wrocław, investigated the effect of N fertilization and the date of harvest on the accumulation of nutrients in two pea morphotypes: Agra – leafless and traditional Rola cultivars. The dry weight accumulation in pea seeds, pod-shells and stems was determined by seed ripening, weather course and pea cultivar-specific factor, however it did not depend on the N fertilization. In the period from green to full maturity the plants demonstrated some changes: the share of seeds in seed yield increased, whereas the share of pod-shells and stems decreased; the content of total protein, fat, fiber and crude ash as well as P, K, Mg in seeds decreased and the share of NFE increased. In pod-shells and in stems the content of total protein, fat, NFE, P and the energy value decreased, while the content of fiber – increased. The share of seeds, pod-shells and stems in organic and mineral nutrients accumulation differed and dependent on the development phase and was cultivar-specific.

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